package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.annotation.AccessType;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WEIXIN_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空,如果为空表示登录失败,排除业务异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);
        //如果是新用户,自动完成注册
        if(user == null){
          user  = User.builder()
                          .openid(openid)
                                  .createTime(LocalDateTime.now())
                                          .build();
            userMapper.insert(user);//controller中还会用到id所以需要返回
        }

        //返回这个用户对象
        return user;
    }

    //抽取方法ctrl+alt+m

    /**
     * 调用微信接口服务,获取当前用户的 openid
     * @param code
     * @return
     */
    public String getOpenid(String code) {
        // 调用微信接口服务,获取当前用户的openid
        Map<String,String>map = new HashMap<>();
        //用配置属性类WeChatProperties读取yml文件
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WEIXIN_LOGIN_URL, map);
        //从返回得到的json数据解析得到openid
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }

}
